Cycloid hydraulic motor linkage shaft

Abstract

The utility model relates to the technical field of hydraulic motors, in particular to a cycloid hydraulic motor universal driving shaft which is connected between a rotor and an output shaft of a cycloid hydraulic motor and comprises a universal driving shaft body, outer splines are arranged at the two ends of the universal driving shaft body, the outer splines are in a drum shape, and contact surfaces are arranged between adjacent teeth. And the contact surface is matched with the cycloidal gear and teeth of the internal spline on the output shaft. The universal driving shaft has the advantages of being large in torque and high in strength.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic motors, in particular to a cycloid hydraulic motor linkage shaft. Background Art

[0002] Cycloidal hydraulic motor is a type of hydraulic motor. It is an energy conversion device that converts hydraulic energy into mechanical kinetic energy and is used to drive mechanical parts to rotate. Cycloidal hydraulic motor is named because it has a cycloidal stator and rotor integrated inside. The rotor in the cycloidal stator and rotor is formed by the equidistant lines of the cycloid. The stator and rotor cooperate to complete the oil suction and discharge of the motor, thereby driving the moving parts to rotate. Cycloidal hydraulic motors are widely used and are mainly used in the rotary mechanisms of various machinery such as agriculture, fishery, light industry, lifting and transportation, mining, and engineering machinery. Cycloidal hydraulic motors are low-speed motors. When the cycloidal motor is above 500 rpm, the output torque is very limited and cannot work in the appropriate working conditions of the motor; and the linkage shaft of the cycloidal hydraulic motor is also prone to wear and even shaft breakage due to its own structural defects under high torque and high speed conditions. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the cycloidal hydraulic motor is a low-speed motor. When the cycloidal motor rotates at more than 500 revolutions, the output torque is very limited and the motor cannot work under suitable working conditions. Moreover, the linkage shaft of the cycloidal hydraulic motor is also prone to wear and even shaft breakage due to its own structural defects under conditions of high torque and high speed.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a cycloidal hydraulic motor linkage shaft, comprising a linkage shaft body, an output shaft and a cycloidal wheel, the linkage shaft body is connected between the cycloidal wheel and the output shaft, both ends of the linkage shaft body are provided with external splines, the external splines of the linkage shaft body are in a drum shape, and contact surfaces are provided between adjacent teeth, and the contact surfaces are adapted to the teeth of the internal splines on the cycloidal wheel and the output shaft.

[0005] The external splines of the linkage shaft body are curved surfaces that match the teeth of the internal splines on the cycloid wheel and the output shaft.

[0006] The outer spline curved surface of the linkage shaft body is composed of three sections: a first plane, a curved surface and a second plane.

[0007] The first plane, the curved surface and the second plane are tangent to each other, and the curved surface is tangent to the tooth top surface of the cycloid wheel.

[0008] The friction pair surfaces of the splines of the linkage shaft body and the inner splines of the cycloid wheel are provided with nano-sulfur-selenide solid lubricants.

[0009] The beneficial effects of the utility model are:

[0010] (1) The utility model provides a cycloid hydraulic motor linkage shaft, through the optimization design of the three-section external spline of the first plane, the curved surface and the second plane, specifically adjusting the parameters of the three-section surface of the external spline, so that the linkage shaft body can better cooperate with the rotor and the drive shaft, increase the torque, and improve the adaptability strength;

[0011] (2) By using nano-sulfur selenide solid lubricant to treat the friction surface of the drum involute external spline and the cycloid wheel internal spline, the wear loss caused by radial force is reduced, the motor life is increased, and the practicality is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a structural schematic diagram of the linkage shaft body in the utility model.

[0015] Figure 3 It is a structural schematic diagram of the tooth top surface in the utility model. DETAILED DESCRIPTION

[0016] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Figure 1 , Figure 2 and Figure 3 A cycloidal hydraulic motor linkage shaft shown in the figure includes a linkage shaft body 1, an output shaft 2 and a cycloidal wheel 3. The linkage shaft body 1 is connected between the cycloidal wheel 3 and the output shaft 2. External splines are provided at both ends of the linkage shaft body 1. The external splines of the linkage shaft body 1 are drum-shaped, and contact surfaces are provided between adjacent teeth. The contact surfaces are adapted to the teeth of the internal splines on the cycloidal wheel 3 and the output shaft 2.

[0019] The external splines of the linkage shaft body 1 are curved surfaces that match the teeth of the internal splines on the cycloid wheel 3 and the output shaft 2 .

[0020] The outer spline curved surface of the linkage shaft body 1 is composed of three sections: a first plane 11 , a curved surface 12 and a second plane 13 .

[0021] The first plane 11 , the curved surface 12 and the second plane 13 are tangent to each other, and the curved surface 12 is tangent to the tooth top surface 31 of the cycloid wheel 3 .

[0022] The friction pair surfaces of the splines of the linkage shaft body 1 and the inner splines of the cycloid wheel 3 are provided with nano-sulfur selenide solid lubricants.

[0023] The design steps of the linkage shaft are as follows:

[0024] S1: With the goal of reducing the wear of the drum-shaped involute external spline of the cycloidal motor, the optimization objects of the drum-shaped involute external spline are selected, and the selected optimization objects of the drum-shaped involute external spline are: the first plane 11, the curved surface 12, and the second plane 13; and different structural parameters related to the optimized objects are selected for parametric modeling, and structural models of the drum-shaped involute external spline with different structural parameters are obtained;

[0025] The optimized drum-shaped involute external spline structure is as follows: Figure 2 As shown, the specific optimized structural parameters are: the tangent angle between the first plane 11, the curved surface 12 and the second plane 13, and the arc radius of the curved surface 12; by combining the above two parameters respectively, the geometric model of the cycloid motor with different structural parameters can be obtained.

[0026] Specifically, refer to Figure 2 The linkage shaft body is a three-section drum-shaped involute external spline. The curved surface 12 is tangent to the top surface 31 of the internal spline tooth of the cycloid wheel. The first plane 11, the curved surface 12 and the second plane 13 are tangent to each other. Such a structure enables the linkage shaft to smoothly transition from a plane to a curved surface and from a curved surface to a plane during the meshing process with the cycloid wheel, even if there is an angle of misalignment between the two. This structure can reduce the wear between the linkage shaft and the cycloid wheel to a certain extent, thereby increasing the life of the motor.

[0027] S2: Establish the geometric model of the drum-shaped involute external spline and the cycloid wheel 3 in Solidworks, complete the matching, import the drum-shaped involute external spline and the cycloid wheel 3 model into ANSYS, set the meshing parameters for meshing, set the boundary conditions and meshing for the model, and obtain the simulation results of the corresponding geometric model through simulation calculation.

[0028] S3: The optimization target of the spline structural parameters is to minimize the wear of the drum-shaped involute external spline of the cycloid motor. The upper and lower limits of the radius of the 12 arcs of the curved surface are used as constraints to establish the optimization problem. The structural parameters are selected through three experimental design methods: orthogonal design, Latin hypercube and optimized hypercube. The mapping relationship between the structural parameters and the tooth surface contact stress is established using the surrogate model, the accuracy of the surrogate model is verified, and the appropriate surrogate model is selected. Finally, the optimization algorithm is used to find the optimal solution, and the structural parameters of the drum-shaped involute external spline optimization object are obtained, realizing the optimal design of the drum-shaped involute external spline of the cycloid motor.

[0029] The nano-sulfur selenide solid lubricant plays an important role in the field of lubrication, and its main functions include: 1. Sulfur selenide has low surface adhesion ability and high lubricity; 2. It can form a uniform lubricating film on the friction surface, reduce the friction resistance when the surface contacts, reduce the contact pressure between the friction surfaces, improve the lubrication conditions of the friction interface, improve the lubrication effect, and reduce energy loss; 3. Sulfur selenide has a certain hardness and wear resistance, and can form a strong protective film on the friction surface, reduce surface wear and fatigue damage, and extend the service life of equipment and parts; 4. Sulfur selenide solid lubricant can form a uniform protective film to prevent the metal surface from being corroded and oxidized by environmental factors such as air and water vapor, and improve the durability and stability of mechanical equipment. In summary, the use of nano-sulfur selenide solid lubricant can reduce the wear of drum involute external splines to a certain extent, thereby improving the overall performance of the motor and extending the life of the motor.

[0030] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A cycloid hydraulic motor linkage shaft, comprising a linkage shaft body (1), an output shaft (2) and a cycloid wheel (3), wherein: The linkage shaft body (1) is connected between the cycloid wheel (3) and the output shaft (2), and both ends of the linkage shaft body (1) are provided with external splines, the external splines of the linkage shaft body (1) are in a drum shape, and contact surfaces are provided between adjacent teeth, and the contact surfaces are adapted to the teeth of the internal splines on the cycloid wheel (3) and the output shaft (2); The external splines of the linkage shaft body (1) are curved surfaces that match the teeth of the internal splines on the cycloid wheel (3) and the output shaft (2); The outer spline curved surface of the linkage shaft body (1) is composed of three sections: a first plane (11), a curved surface (12) and a second plane (13); The first plane (11), the curved surface (12) and the second plane (13) are tangent to each other, and the curved surface (12) is tangent to the tooth top surface (31) of the cycloid wheel (3).

2. The cycloid hydraulic motor linkage shaft according to claim 1, characterized in that: The friction pair surfaces of the splines of the linkage shaft body (1) and the inner splines of the cycloid wheel (3) are provided with nano-sulfur selenide solid lubricant.

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